books.google.co.in - Indian philosophy bases itself on three states of consciousness: waking, dreaming, and deep sleep. Deep sleep, or sus|upti, plays an important role in Advaita Vedaμnta, the major philosophical school that advocates a doctrine of pure consciousness. Explaining and savoring this paradox, this book shows...http://books.google.co.in/books/about/Sleep_as_a_State_of_Consciousness_in_Adv.html?id=dLbHcAf8NdMC&utm_source=gb-gplus-shareSleep as a State of Consciousness in Advaita Vedanta